So surprisingly enough, I'm looking for a background that I can't seem to find anywhere I look.
Saw this on some other SMBX forum post from a while back. I've tried reverse image search and tried looking up the (possible) creator's name, but nothing came up. It's pretty much just one of the NSMB volcano backgrounds remade into a normal 16-bit style.
Image is kinda small since the original posted image was deleted, I guess, so this is all I could get from Google Images. I have no idea who made it or where I can find it, but I know it should be somewhere online.